The last few weeks has seen my FC drop. Last week was 4 and today is 3 (CYA is 50). My salt is reading 2900 with a 50% output. Should I raise the output to 70% and check again in a few days or go ahead and shock the pool now?. I have some Fresh and Clear Oxidizing Shock and some trichlor tablets. Also, how long after adding acid can I try to raise the chlorine? Thank you!